This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A113527 #15 Oct 09 2022 05:20:43
%S A113527 15,115,155,201,253,445,785,1345,2215,3503,3711,4145,4841,5853,6395,
%T A113527 7855,9131,12353,13535,14353,16503,18331,19281,20255,20751,21253,
%U A113527 21761,23853,24935,26603,29503,30101
%N A113527 Semiprimes in A056108.
%C A113527 Intersection of A056108 and A001358.
%H A113527 Michael De Vlieger, <a href="/A113527/b113527.txt">Table of n, a(n) for n = 1..10000</a>
%F A113527 {a(n)} = {3*n^2 + n + 1 iff semiprime}. {a(n)} = A056108 INTERSECT A001358.
%e A113527 a(1) = 15 because A056108(2) = 15 = 3 * 5 is semiprime.
%e A113527 a(2) = 115 because A056108(6) = 115 = 5 * 23 is semiprime.
%e A113527 a(32) = 30101 because A056108(100) = 30101 = 31 * 971 is semiprime.
%t A113527 Select[Array[3 #^2 + # + 1 &, 100], PrimeOmega[#] == 2 &] (* _Michael De Vlieger_, Mar 17 2021 *)
%Y A113527 Cf. A001358, A056108.
%Y A113527 Cf. A113519, A113524, A113525, A113528, A113530.
%K A113527 easy,nonn
%O A113527 1,1
%A A113527 _Jonathan Vos Post_, Jan 12 2006